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From:   Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
To:     marcel@holtmann.org, linux-bluetooth@vger.kernel.org
Cc:     chromeos-bluetooth-upstreaming@chromium.org,
        Abhishek Pandit-Subedi <abhishekpandit@chromium.org>,
        "David S. Miller" <davem@davemloft.net>,
        Johan Hedberg <johan.hedberg@gmail.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Jakub Kicinski <kuba@kernel.org>
Subject: [PATCH 2/2] Bluetooth: Modify LE window and interval for suspend
Date:   Tue, 12 May 2020 19:09:33 -0700
Message-Id: <20200512190924.2.Ibdf1535b0d4c63aaf337161a333b419d6d32c364@changeid>
In-Reply-To: <20200513020933.102443-1-abhishekpandit@chromium.org>
References: <20200513020933.102443-1-abhishekpandit@chromium.org>
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Sender: linux-bluetooth-owner@vger.kernel.org
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When a device is suspended, it doesn't need to be as responsive to
connection events. Increase the interval to 640ms (creating a duty cycle
of roughly 1.75%) so that passive scanning uses much less power (vs
previous duty cycle of 18.75%). The new window + interval combination
has been tested to work with HID devices (which are currently the only
devices capable of wake up).

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
---

 net/bluetooth/hci_request.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index f6870e98faab2..6b45e31432a77 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -35,7 +35,7 @@
 #define HCI_REQ_CANCELED  2
 
 #define LE_SUSPEND_SCAN_WINDOW		0x0012
-#define LE_SUSPEND_SCAN_INTERVAL	0x0060
+#define LE_SUSPEND_SCAN_INTERVAL	0x0400
 
 void hci_req_init(struct hci_request *req, struct hci_dev *hdev)
 {
-- 
2.26.2.645.ge9eca65c58-goog